Nu-chlorophenyldiguanidino compounds



Patented July 27, 1954 UNITED N- CHLGRQPHENYLDIGUANIDINO COMPOUNDS Francis Leslie Rose and Geofirey Swain, Blackley,

Manchester, England, assignors to Imperial Chemical Industries Limited, a corporation of Great Britain No Drawing. Application January 28, 1952,

Serial No. 268,662

Claims priority, application Great Britain February 5, 1951 7 Claims.

wherein A stands for a phenyl radical, which is substituted by alkyl, alkoxy, nitro or halogen and wherein the two as may be the same or different and wherein n is an integer from 3 to 9 inclusive and wherein the polymethylene chain may be interrupted by oxygen atoms and/or by aromatic nuclei.

According to a further feature of the invention we provide a process for the manufacture of the said new bactericidal substances which comprises interaction of a suitable polymethylene bisdicyandiamide with one or more amines of the formula ANI-I2 wherein A has the meaning stated above.

According to yet a further feature of the invention we provide another process for the manufacture of the said new bactericidal substances which comprises interaction of a suitable polymethylenediamine with a dicyandiamide of the formula A--NH-C (:NH)Nli-CN wherein A has the meaning stated above.

As stated above, the new substances are useful as bactericides. We have found for example that those of the new substances which are of the formula NE NE NH lu H wherein A stands for a halogen substituted phenyl radical, possess very high antibacterial activity when tested in vitro against the organisms Streptococcus haemolyticus, Staphylococcus aureus, Bacillus coli, Clostrz'dium wclchii and Pseudomonas pyocycmea.

Because of their high degree of antibacterial activity the new substances are useful for many purposes, for example in medical and surgical practice for sterilisation of instruments or of body tissues, as additions to wood pulp to obviate the decay consequent on the growth of fungi and bacteria, as additives to rubber latex like wise for preservative purposes, for the control of slime in paper mills and they are useful also as moth-proofing agents for textiles.

2 The invention is illustrated but not limited by the following examples in which the parts are by weight.

Example 1 25 parts of hexamethylene bis-dioyandiamide, 35 parts of p-chloroaniline hydrochloride and 250 parts of c-ethoxyethanol are stirred together at -140" C. for 2 hours under reflux. The mixture is then cooled and filtered and the solid is washed with water and crystallised from 50% aqueous acetic acid. 1:6-di-(N1:N1-p-chlorophenyldiguanido N51N5) hexane dihydrochloride is obtained as colourless plates of M. P. 258-260" C.

Example 2 19.4 parts of p-chlorophenyldicyanidamide, 9.4 parts of hexamethylenediamine dihydrochloride and 100 parts of nitrobenzene are stirred together and heated at 150-160 C. for 6 hours. The mixture is cooled, diluted with 200 parts of benzene and filtered. The solid residue is washed with benzene and crystallised from 50% acetic acid. 1:6 d1 (N1:N1' p chlorophenyldiguanido- Ns:Ns')-hexane dihydrochloride is obtained, identical with that prepared as described in Example 1.

Ezrample 3 25 parts of hexamethylene bis-dicyandiamide, 29 parts of p-toluidine hydrochloride and 250 parts of B-ethoxyethanol are stirred and heated together under reflux for 2 hours at C. The mixture is then filtered and the solid is washed with ethanol and crystallised from aqueous c-ethoxyethanol to give 1:6-di-(N1:N1'-p-to1y1- diguanido N51N5') hexane dihydrochloride as colourless crystals of M. P. 263-264" C.

In a similar manner 1:6-di-(N1:N1-p-anisyldiguanido-NizNs') -hexane dihydrochloride is obtained from hexamethylene bis-dicyandiamide (25 parts) and p-anisidine hydrochloride (32 parts). It crystallises from a mixture of methanol and ethanol (1:6) in needles of M. P. 238- 2iO C.

Example 4 21. parts of trimethylene bis-dicyandiamide, 33 parts of p-chloroaniline hydrochloride and 200 parts of c-ethoxyethanol are stirred together at Mil-159 C. under reflux for 4 hours. The mixture is cooled and diluted with 80 parts of dry ether and the solid is separated and dissolved in hot water. The solution is filtered and the filtrate allowed to cool. The solid consists of 1:3- di-(N1:N1' p chlorophenyldiguanido-N5:Na')- pentane dihydrochloride, M. P. 221-222 C. with decomposition.

Example 5 22 parts of tetramethylene bis-dicyandiamide, 33 parts of p-chloroaniline hydrochloride and 200 parts of B-ethoxyethanol are stirred together at 140-l50 C. under reflux for 3 hours. [he mixture is then cooled and filtered and the solid is washed with ethanol and crystallised from hot water. 1:4-di-(N1:N1' -p-chlorophenyldiguanido- N5:N5')-butane dihydrochloride is obtained, M. P. 253-254 C.

Example 6 24 parts of pentamethylene bis-dicyandiamide, 33 parts of p-chloroaniline hydrochloride and 200 parts of -ethoxyethanol are stirred together at 140-150 C. under reflux for 6 hours. The mixture is then cooled and the solid is washed with ethanol and crystallised from hot Water. 1:5-di- (NizNi' p chlorophenyldiguanido llsztls) pentane dihydrochloride is obtained as small colourless needles, M. P. 250 C.

Example 7 26 parts of heptamethylene bis-dicyandiamide, 33 parts of p-chloroaniline hydrochloride and 250 parts of fi-ethoxyethanol are stirred together at Mil-150 C. under reflux for 90 minutes. The mixture is then cooled and filtered and the solid is washed with ethanol and recrystallised from hot Water, 1 :l di (N1:l l1'- p chloronh- =.yldiguanido-N:I T5')-heptane dihydrochloride is obtained as a colourless crystalline solid of M. P. 253-254 C.

Example 8 parts of hexamethylene his-dicyandiamide. 13.2 parts of in-chloroaniline hydrochloride and 109 parts of ,B-ethoxyethanol are stirred together at 145 C. under reflux for 9 hours. The mixture is cooled and the filtrate is diluted with water and filtered. Ammonium chloride in l0% aqueous solution is added to the filtrate which is again filtered and the solid so obtained is crystallised from 50% aqueous ethanol. lzfi-di-(NrzNfl-mchlorophenyldiguanido-Ns 2N5) -hexane dihydrechloride is obtained as a colourless crystalline solid, M. P. 233-234 C.

Example 9 10 parts of hexainethylene his-dicyandiarnide, 15.1 parts of 2:5-dichloroaniline hydrochloride and 100 parts of c-ethoxyethanol are stirred together under reflux for 3 hours. The mixture is cooled and filtered and the solid is Washed with acetone. It is then recrystallised from 40 aqueous ethanol. 1 :6-di- (N1 1N1 -2 :S-dichlorophenyldiguanido-NszNs) -hexane dihydrochloride is obtained as cream-coloured needles, M. P. 249- 250 C.

Eatample 10 10 parts of hexamethylene bis-dicyandiamide, parts of 3:4-dichloroaniline hydrochloride and 50 parts of fi-ethoxyethanol are stirred together under reflux at JAG-145 C. for .9 hours. The mixture is cooled and 50 parts of c-ethoxyethanol are added. It is then filtered and the solid is washed with ethanol and acetone. 1:6-di- (N1:N1-3:4-dichlorophenyldiguanido NsZNs') hexane dihydrochloride is obtained as colourless crystals, M. P. 259-260 C.

Example 11 Example 12 19.2 parts of hexamethylene bis-dicyandiamide, 15 14.? parts of in-nitroaniline hydrochloride and lo parts of 70% aqueous dioxan are mixed and the mixture is stirred and heated under reflux for 10 hours. It is then cooled and 200 parts of water and 52 parts of saturated brine are added. It is then filtered and the solid is washed with water and recrystallised from water. 1:6-di- (NizNl' in nitrophenyldiguanido NszNs") hexane dihydroehloride is obtained as a pale yellow crystalline solid M. P. 234-235 C. What we claim is:

1. New hactericidal substances which in their free for-r11 are the formula:

i-i-irr-o-Nir-o-NH- oEi],.-NH-0Nn-oNH-A II II NH NH a chlorinated phenyl radical the group consisting of monoand 1 phenyl radicals and wherein n is :1 from the integers 5, 6 and 7.

2. 1:6 di(l l1:l\ 1 p chlorophenyldiguanido NsINs') hexane.

NsINs') pentane. 4. 1 z? di(N1:l\ 1' p chlorophenyldiguanido rlszNs) heptane.

1:6 di(l\ 1:N1 mchlorophenyldiguanido- NsZNs') hexane.

6. 1:5 di'iNizNi' 2:5 dichlorophenyldi guanido NsINs) hexane.

'l. The method of destroying bacteria which comprises subjecting the bacteria to the. action of a substance which in its free base form has the.

formula wherein A stands for a chlorinated phenyl radical selected from the group consisting of monodichlorinated phenyl radicals and wherein n is selected from the integers 5, 6 and '7.

Cited in the file of this patent UNITED STATES PATENTS Slotta et al., Ber. deut. Chem., vol. 62v (1929),. page 1404. 

1. NEW BACTERICIDAL SUBSTANCES WHICH IN THEIR FREE BASE FORM HAVE THE FORMULA: 